GOG version.
Use Ubuntu 22 files in a chroot.
Install via sh setup_projectzomboid.sh

In game/projectzomboid/ProjectZomboid64.json change "-XX:+UseZGC", to "-XX:+UseG1GC",

Run the game in a Linux chroot. (su -m ; chroot {linux} ; su -m {your user}; start the game via `sh start.sh`)

Enjoy!

👍